Process-closure for jars.



C. HAMMER.

PROCESS CLOSURE FOR JARS.

APPLICATION FILED MAR. 9. 1918.

1,321,205. 7 Patented Nov. 11, 1919.

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CHARLES HAMMER, OF QUEENS, NEW YORK, ASSIGNOR TO AMERICAN METAL CAP COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

PROCESS-CLOSURE FOR JARS.

Application filed March 9, 1918.

To all whom it may concern:

Be it known that I, CHARLES HAMMER, a citizen of the United States, residing at Queens, in the county of Queens and State of New York, have invented certain new and useful Improvements in Process-Closures for Jars, of which the following is a specification.

This invention relates to jar closures, especially to what are known as wide'mouth jars; and in which a cap of sheet metal is placed on top of the glass jar, and the same inserted in a closed chamber, and the air exhausted therefrom; or the contents of the jar may be boiled to produce a steam or vapor, and then the closure applied under slight pressure, so that a partial vacuum is produced by the condensation of the vapor. In either instance the scaling is effected by the atmospheric pressure, a vacuum being produced inside of the cover, and the air pressure will force the cap on the jar without the employment'of mechanical pressure by means of a chuck or the like.

The object of the present invention is to provide a closure for this purpose, adapted for use with a wide mouth jar provided with a shoulder on the outer wall of the neck below th top, in which the composition washer or gasket will be held to project inwardly beneath a substantially horizontal shoulder, in which construction the gasket will have a strong support both at the top and side, to engage the top face of the shoulder or flange on the jar.

In the accompanying drawing showing 7 one embodiment of my invention Figure 1 shows in section the cap in sealed position on the jar. Fig. 2 is a partial section onlarged of the cap as partially formed. Fig. 3 .is a similar view with the gasket secured in the cap, in the finished condition of the cap ready for application; and Fig. 1 shows in enlarged section the cap applled to the 1211'.

comprises .a top 5 and a downwardly extending flange 6, with which it connects by an arch portion 7, that extends slightly upward above the center of the cap. The flange is caused to extend horizontally outward as shown at 8, and thereupon has a downward extension 9 substantially vertical, the lower edge or margin being bent llOll- Specification of Letters Patent.

As set forth in the drawing the closure Patented Nov. 11, 19119.

zontally inward to form the flange 13, as indicated in Fig. 2.

When so formed a flat ring gasket 12 is laid in the cap to rest against the flange 8, as shown in Fig. 2; and thereupon this flange is bent upwardly to the position shown at 13 in Fig. 3, making a sharp angle with the vertical wall 9 as shown in Fig. 3, which erves to compress the edge of the gasket in the angular channel formed by the portions 9 and 13, as illustrated, This will cause'the gasket 12 to be pressed upwardly against the horizontal wall 8 as shown in Fig. 3, that will constitute a support for the gasket, whose lower wall adjacent the flange 13 forms the seat for the jar edge. 1

The form of jar 14 that is illustrated, is provided with a shoulder on the outer wall below the top rim 15, which-provides a horizontal face 16, anda vertical face or wall 17. The shoulder extends some distance beyond the top rim 15 so that the jar is free from contact with the closure at the rim.

In the use of this form of cap and jar, the jar is filled with the desired contents, and then the closure is simply laid on top of the jar by hand to rest lightly in proper -position,'that in Fig. 4 is shown to have the gasket 12 resting onthe edge or horizontal wall 16 of the jar shoulder. A spring clamp may be used, as 18, simply to hold, the cap in position during the sealing operation. Since the cap rests on the jar during the boiling process by its weight and the spring pressure of the clamp 18, the air inside of the closure will be forced out. for which purpose the cap will raise. When cooled the closure will be forced down on the jar by the atmospheric pressure, and in view of its comparatively large area a very strong pressure is obtained. It will be seen that the gasket will be pressed against theflat face or shoulder 16 of the jar over a considerable extent of surface, and that the'gasket is trongly supported by the horizontal and vertical portions 6 and 8 of the closure, above this portion of the gasket. I

It will be further seen that the skirt formed by the portions 9 and 13 constitutes when pplied to the jar. Also when the closure will be raised by the steam during the applying process, this inclined wall will serve to retain the closure in proper sealing position and prevent its displacement.

What I claim is:

1. The combination with a jar provided with a rim at the top, the wall below. the rim extending horizontally outward and abruptly downward to provide a shoulder, of a jar cover comprisin a top and an annular flange, the flange elow the top portion having a flat portion that extends horizontally outward andthen vertically downward to form a skirt with the lower edge or margin bent abruptly upward' on the inside of the flange to form a narrow wedgeform channel open at the top below said horizontal wall of the flange, said skirt forming a reinforced upwardly converging inner wall arranged to guide the closure to sealing position and retain it in such position during the sealing process, and a flat ring gasket of compressible material havmenace form a skirt with the lower edge or margin 4 a bent abruptly upward on the inside of the flange to form a narrow wedge-form channel open at the top below said horizontal wall, said skirt forming a reinforced upwardly converging inner wall arranged to guide the closure to sealingposition, and a fiat ring gasket of compressible material having it outer edge tightly compressed in said wedge channel and extending inwardly from the channel in a horizontal direction only and engaging said horizontal wall on the inside of said depending portion.

Signed at New York city, N. Y., on February 19th, 1918. 

